CN219367616U - Upper air inlet combustor with central convection injection structure - Google Patents

Abstract

The utility model discloses an upper air inlet combustor with a central convection injection structure, which comprises: the gas distribution plate assembly, the injection pipe assembly, the outer ring fire cover, the inner ring fire cover and the plurality of gas nozzles; the ejector pipe assembly is arranged below the gas distribution disc assembly, two ejector channels are arranged in a central symmetrical structure corresponding to the outer ring gas mixing cavity, and two ejector channels are also arranged in a central symmetrical structure corresponding to the inner ring gas mixing cavity; the air inlet end of the injection channel is correspondingly provided with a gas nozzle. According to the utility model, the two injection channels are arranged in a central symmetry manner, so that the gas can form rotary air flow in the annular gas mixing cavity, the gas air flow can be subjected to multiple rotary mixing in the annular gas mixing cavity, the mixing degree of the gas in the gas mixing cavity is effectively improved, and the combustion efficiency of the outer ring gas is improved. And checking all the ejection capacity parameters by using a simulation approach to obtain the throat aperture of the ejection pipe and the better value design of the ejection pipe and the gas nozzle.

Description

Upper air inlet combustor with central convection injection structure

Technical Field

The utility model relates to the technical field of gas cookers, in particular to an upper air inlet combustor with a central convection injection structure.

Background

The burner is used as a main combustion element of the gas stove, and the combustion efficiency is always the focus of the design and research of manufacturers. The existing burner generally improves the mixing ratio of fuel and air by prolonging the path of the gas supply channel in the injection pipe so as to improve the combustion efficiency. The lack of further thinking and optimization debugging of the injection structure details of the split air disk has limited improvement on combustion efficiency. Accordingly, there is a need for further improvements and optimizations to the burner jet tube structure.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides an upper air inlet combustor with a central convection injection structure.

The technical scheme adopted by the embodiment of the utility model for solving the technical problems is as follows: an upper air intake burner with a central convection injection structure, comprising: the gas distribution plate assembly, the injection pipe assembly, the outer ring fire cover, the inner ring fire cover and the plurality of gas nozzles;

the gas distribution disc assembly is provided with an inner ring gas mixing cavity and an outer ring gas mixing cavity which are annularly arranged; the inner ring fire cover and the outer ring fire cover are respectively covered above the inner ring air mixing cavity and the outer ring air mixing cavity; the injection pipe assembly is arranged below the gas distribution disc assembly, two injection channels are arranged in a central symmetrical structure corresponding to the outer ring gas mixing cavity, and two injection channels are also arranged in a central symmetrical structure corresponding to the inner ring gas mixing cavity; and the gas inlet end of the injection channel is correspondingly provided with the gas nozzle.

Optionally, the injection channel is a venturi tube structure and comprises an injection tube inlet, a contraction section, a throat section, an expansion section and an injection tube outlet.

Optionally, the aperture of the throat section of the injection channel communicated with the inner ring air mixing cavity is 6mm to 8mm; the aperture of the throat section of the injection channel communicated with the outer ring air mixing cavity is 9mm to 10mm.

Further, the aperture of the throat section of the injection channel communicated with the inner ring air mixing cavity is 8mm; the aperture of the throat section of the injection channel communicated with the outer ring air mixing cavity is 10mm.

Optionally, the axial distance between the inlet of the injection pipe of the injection channel communicated with the inner ring mixing cavity and the gas nozzle is in the range of-2 mm to 2mm; the axial distance between the inlet of the injection pipe of the injection channel and the gas nozzle, which is communicated with the outer ring gas mixing cavity, is within the range of-3 mm to 1mm.

Further, the axial distance between the inlet of the injection pipe of the injection channel communicated with the inner ring gas mixing cavity and the gas nozzle is-1 mm or 1mm; the axial distance between the inlet of the injection pipe of the injection channel and the gas nozzle, which is communicated with the outer ring gas mixing cavity, is-2 mm.

Optionally, the ejector tube assembly comprises an ejector tube seat and an ejector tube cover which are detachably assembled; the injection pipe cover can be embedded in the injection pipe seat and surrounds to form the injection channel.

The utility model has the beneficial effects that: the injection pipe assembly is arranged below the gas distribution disc assembly, two injection channels are arranged in a central symmetrical structure corresponding to the outer ring gas mixing cavity, and two injection channels are also arranged in a central symmetrical structure corresponding to the inner ring gas mixing cavity; the two injection channels are arranged in a central symmetry manner, so that the gas can form rotary air flow in the annular gas mixing cavity, and the gas can be rotationally supplied through the symmetrical two air flows, so that the gas flow can be rotationally mixed for a plurality of times in the annular gas mixing cavity, the mixing degree of the gas in the gas mixing cavity is effectively improved, and the combustion efficiency of the outer ring gas is improved. According to the utility model, further, the ejection capacity is taken as a target parameter, and under the condition of changing the aperture of the throat in the ejection channel and the axial distance parameter between the gas nozzle and the inlet of the ejection pipe, the ejection capacity parameters are checked by using a simulation approach, so that the throat aperture of the ejection pipe and a better value design with the gas nozzle are obtained, and the better ejection capacity is obtained.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of an upper inlet air burner with a central convection injection structure of the present utility model;

FIG. 2 is a bottom view of the burner of FIG. 1;

FIG. 3 is a cross-sectional view taken along line V1-V1 of FIG. 2;

FIG. 4 is an exploded view of the burner of FIG. 1;

FIG. 5 is a graph showing the relationship between the throat diameter of the central injection pipe and the flame stabilizing Kong Yinshe coefficient of the fire hole of the fire cover;

FIG. 6 is a graph showing the relationship between the diameter of the throat of the outer ring injection pipe and the fire hole of the fire cover and the Kong Yinshe coefficient of flame stabilization;

FIG. 7 is a graph of the axial distance between the inlet of the central eductor and the gas nozzle versus the eductor coefficient and average flow rate of the fire cap;

FIG. 8 is a graph of the axial distance between the inlet of the outer ring ejector tube and the gas nozzle versus the ejection coefficient and average flow rate of the fire cover.

Description of main reference numerals:

10. a gas distribution plate assembly; 11. an inner ring air mixing cavity; 12. an outer ring mixing cavity; 20. an ejector tube assembly; 21. injection tube seat; 22. an ejector tube cover; 30. an outer ring fire cover; 31. a fire hole; 32. flame stabilizing holes; 40. an inner ring fire cover; 50. a gas nozzle; 60. an injection channel; 61. an ejector tube inlet; 62. a constriction section; 63. a laryngeal inlet section; 64. an expansion section; 65. and an outlet of the injection pipe.

Detailed Description

Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.

In the description of the present utility model, plural means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and the above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the present utility model, unless clearly defined otherwise, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and may be connected directly or indirectly through an intermediary; the connecting device can be fixedly connected, detachably connected and integrally formed; may be a mechanical connection; may be a communication between two elements or an interaction between two elements. The specific meaning of the words in the utility model can be reasonably determined by a person skilled in the art in combination with the specific content of the technical solution.

Examples

Referring to fig. 1 to 4, an upper air intake burner with a central convection injection structure according to the present utility model includes: the gas distribution plate assembly 10, the injection pipe assembly 20, the outer ring fire cover 30, the inner ring fire cover 40 and the plurality of gas nozzles 50;

the gas distribution disc assembly 10 is provided with an inner ring gas mixing cavity 11 and an outer ring gas mixing cavity 12 which are annularly arranged; the inner ring fire cover 40 and the outer ring fire cover 30 are respectively covered above the inner ring mixed air cavity 11 and the outer ring mixed air cavity 12; the injection pipe assembly 20 is arranged below the gas distribution disc assembly 10, two injection channels 60 are arranged corresponding to the outer ring gas mixing cavity 12 in a central symmetry structure, and two injection channels 60 are also arranged corresponding to the inner ring gas mixing cavity 11 in a central symmetry structure; the air inlet end of the injection passage 60 is correspondingly provided with a gas nozzle 50.

In the utility model, the injection pipe assembly 20 is arranged below the gas distribution disc assembly 10, two injection channels 60 are arranged corresponding to the outer ring gas mixing cavity 12 in a central symmetry structure, and two injection channels 60 are also arranged corresponding to the inner ring gas mixing cavity 11 in a central symmetry structure; the two injection channels 60 which are arranged in a central symmetry way can enable the fuel gas to form rotary air flow in the annular gas mixing cavity, and the rotary air supply is carried out through the symmetrical two air flows, so that the fuel gas air flow can be subjected to multiple rotary mixing in the annular gas mixing cavity, the mixing degree of the fuel gas in the gas mixing cavity is effectively improved, and the combustion efficiency of the outer ring fuel gas is improved. According to the utility model, further, the ejection capacity is taken as a target parameter, and under the condition of changing the aperture of the throat in the ejection channel 60 and the axial distance parameter between the gas nozzle 50 and the ejection pipe inlet 61, the ejection capacity parameters are checked by using a simulation approach, so that the throat aperture of the ejection pipe and a better value design with the gas nozzle 50 are obtained, and the better ejection capacity is obtained.

In this embodiment, the injection channel 60 is in a venturi structure and includes an injection pipe inlet 61, a constriction section 62, a throat section 63, an expansion section 64, and an injection pipe outlet 65.

By establishing a simulation geometric model corresponding to the upper air inlet burner in fig. 1, simulating the flowing states of fuel gas and air, the average flow velocity of the whole burner can be obtained, and parameters such as injection coefficient at the position of the flame hole 31 or the flame stabilizing hole 32 of the flame cover can be obtained, so that the relation between the injection performance of the whole burner and target parameters can be embodied, and a better design value can be sought.

Taking the aperture of the throat of the central injection pipe as a target parameter as a variable, under the condition of calculating different aperture values through simulation, the relation between the injection coefficient of the fire hole 31 outlet of the fire cover and the injection coefficient of the outlet of the pressure stabilizing hole is shown in fig. 5, and analysis shows that:

when the diameter of the throat opening of the tapered section of the central Venturi tube is increased from 6mm to 8mm, the ejection coefficient of the outlet of the fire hole 31 is gradually increased, and the maximum is 0.71; the injection coefficient of the outlet of the flame stabilizing hole 32 is gradually increased, and the maximum is 0.70. Wherein the optimal value of the throat diameter of the tapered section of the central venturi tube is 8mmm.

Taking the aperture of the throat of the outer ring injection pipe as a target parameter as a variable, under the condition of calculating different aperture values through simulation, the relation between the injection coefficient of the fire hole 31 outlet of the fire cover and the injection coefficient of the outlet of the pressure stabilizing hole is shown in fig. 6, and analysis shows that:

when the diameter of the throat opening of the tapering section of the outer ring venturi tube is increased from 9mm to 10mm, the ejection coefficient of the outlet of the fire hole 31 is gradually reduced to be 0.68 at the highest; the injection coefficient of the outlet of the flame stabilizing hole 32 is gradually reduced to be 0.66 at most. When the length of the throat is prolonged to form a long straight pipe structure, the diameter of the throat opening of the tapered section is adjusted to be 10mm. Compared with the venturi tube, the venturi tube has higher injection coefficient in the form of a strip-shaped straight tube, the injection coefficient of the fire hole 31 is 0.69, and the injection coefficient of the flame stabilizing hole 32 is 0.69.

As can be seen from analysis of fig. 5 and 6, when the burner has a better injection coefficient, the preferred value range of the aperture of the throat section 63 of the injection channel 60 communicated with the inner ring air mixing cavity 11 is 6mm to 8mm; the preferred range of pore diameters for the throat section 63 of the injection passage 60 in communication with the outer annular mixing chamber 12 is 9mm to 10mm.

Wherein, the optimal value of the aperture of the throat section 63 of the injection channel 60 communicated with the inner ring air mixing cavity 11 is 8mm; the optimal value of the aperture of the throat section 63 of the injection channel 60 communicated with the outer ring air mixing cavity 12 is 10mm, and the throat section 63 is integrally arranged in a straight pipe-shaped structure with a long equal aperture.

The relationship between the average flow velocity of the burner as a whole and the injection coefficient of the fire hole 31 of the fire cover and the axial distance is shown in fig. 7 under the condition that the axial distance between the central injection pipe inlet 61 and the gas nozzle 50 is taken as a target parameter as a variable and different axial distance values are calculated through simulation, wherein the axial distance is negative when the gas nozzle 50 falls into the injection pipe inlet 61. Analysis shows that:

the axial distance of the central eductor inlet 61 from the gas nozzle 50 is preferably-2 mm to obtain high simulation values for overall eductor and average flow rate. When the axial distance between the injection pipe inlet 61 of the injection channel 60 communicated with the inner ring air mixing cavity 11 and the gas nozzle 50 is-1 mm or 1mm, the optimal injection coefficient and average flow velocity can be obtained at the central fire cover.

The relationship between the average flow velocity of the burner as a whole and the injection coefficient of the fire hole 31 of the fire cover and the axial distance is shown in fig. 7 under the condition that the axial distance between the inlet 61 of the outer ring injection pipe and the gas nozzle 50 is taken as a target parameter and different axial distance values are calculated through simulation, wherein the axial distance is negative when the gas nozzle 50 falls into the inlet 61 of the injection pipe. Analysis shows that:

the axial distance between the injection pipe inlet 61 of the injection channel 60 communicated with the outer ring gas mixing cavity 12 and the gas nozzle 50 is in the range of-3 mm to 1mm in order to obtain the simulation values with higher overall injection coefficient and average flow rate. When the axial distance between the injection pipe inlet 61 of the injection channel 60 communicated with the outer ring air mixing cavity 12 and the gas nozzle 50 is-2 mm, the optimal injection coefficient and average flow velocity can be obtained at the outer ring fire cover 30.

In this embodiment, the ejector tube assembly 20 includes a removably assembled ejector tube base 21 and ejector tube cover 22; the ejector cover 22 can be embedded in the ejector tube seat 21 and surrounds the ejector channel 60. The injection tube seat 21 and the injection tube cover 22 which are detachably assembled can be respectively processed, and then the injection tube assembly is manufactured through pressing and other processes, so that the pipeline profile of the injection channel 60 is ensured, and the design model is more met.

Of course, the present utility model is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present utility model, and these equivalent modifications and substitutions are included in the scope of the present utility model as defined in the appended claims.

Claims (7)

1. An upper air intake burner with a central convection injection structure, comprising: the gas distribution plate assembly (10), the injection pipe assembly (20), the outer ring fire cover (30), the inner ring fire cover (40) and the plurality of gas nozzles (50);

the gas distribution disc assembly (10) is provided with an inner ring gas mixing cavity (11) and an outer ring gas mixing cavity (12) which are annularly arranged; the inner ring fire cover (40) and the outer ring fire cover (30) are respectively covered above the inner ring air mixing cavity (11) and the outer ring air mixing cavity (12); the injection pipe assembly (20) is arranged below the gas distribution disc assembly (10), two injection channels (60) are arranged in a central symmetry structure corresponding to the outer ring gas mixing cavity (12), and two injection channels (60) are also arranged in a central symmetry structure corresponding to the inner ring gas mixing cavity (11); the gas inlet end of the injection channel (60) is correspondingly provided with the gas nozzle (50).

2. The upper air intake burner with central convection injection structure of claim 1, wherein: the injection channel (60) is in a venturi tube structure and comprises an injection tube inlet (61), a contraction section (62), a throat section (63), an expansion section (64) and an injection tube outlet (65).

3. The upper air intake burner with central convection injection structure of claim 2, wherein: the aperture of the throat section (63) of the injection channel (60) communicated with the inner ring air mixing cavity (11) is 6mm to 8mm; the aperture of the throat section (63) of the injection channel (60) communicated with the outer ring air mixing cavity (12) is 9mm to 10mm.

4. An upper air intake burner with a central convection injection structure as set forth in claim 3 wherein: the aperture of the throat section (63) of the injection channel (60) communicated with the inner ring air mixing cavity (11) is 8mm; the aperture of the throat section (63) of the injection channel (60) communicated with the outer ring air mixing cavity (12) is 10mm.

5. The upper air intake burner with central convection injection structure of claim 2, wherein: the axial distance between the injection pipe inlet (61) of the injection channel (60) communicated with the inner ring gas mixing cavity (11) and the gas nozzle (50) is in the range of-2 mm to 2mm; the axial distance between the injection pipe inlet (61) of the injection channel (60) communicated with the outer ring mixing cavity (12) and the gas nozzle (50) is in the range of-3 mm to 1mm.

6. The upper air intake burner with central convection injection structure of claim 5, wherein: the axial distance between the injection pipe inlet (61) of the injection channel (60) communicated with the inner ring gas mixing cavity (11) and the gas nozzle (50) is-1 mm or 1mm; the axial distance between the injection pipe inlet (61) of the injection channel (60) communicated with the outer ring mixing cavity (12) and the gas nozzle (50) is-2 mm.

7. The upper air intake burner with central convection injection structure of claim 1, wherein: the injection pipe assembly (20) comprises an injection pipe seat (21) and an injection pipe cover (22) which are detachably assembled; the injection pipe cover (22) can be embedded in the injection pipe seat (21) and surrounds to form the injection channel (60).